Improvement in heating air and supplying boilers therewith



2 Sheets sheef'i. G. E. HIBBARD.

Heating Air-and Supplying Boilers The rewith NO.145,568'. vPatented Dec.16,1873.

\flimessesn nvemun @W j%z/mo 5 32/ r I 2 she e t-s Sheet 2. G. E.' H1BB'ABD.. Heating Air and Supplying Boilers The'rewith. No. 145,568, Patented Dec.i6,i873.

Witnesses: [1/ Inventor:

- /ayw /a' ,PBI' e 4 Attorneys.

UNITED STATES PATENT ()FFIQE.

GEORGE E. HIBBARD, OF FOND DU LAO, WISCONSIN.

IMPROVEMENT IN HEATING AIR AND SUPPLYING BOILER S THEREWITH.

Specification forming part ofLetters Patent No. 145,568, dated December 16, 1873; application filcd May 17, 1873.

To all whom it may concern:

Be it known that I, G. EDWIN HIBBARD, of Fond du Lac, in the county of Fond du Lac and State of Wisconsin, have invented a new and useful Improvement in Heating Air and Supplying Boilers therewith, of which the following is a specification:

My invention is an improvement in means for heating and forcing air into the steamspace of a locomotive-engine, as hereinafter described.

Figure 1 is a side elevation of a locomotiveengine with air heating and injecting apparatus. Fig. 2 is a transverse sectional elevation of the front end of the boiler, the smokestack, and the air-heating coil.

A is an air-holder on the top of the boiler, near the smoke-stack B, into which I propose to force air by one or more air-pumps, Gsay, one on each side of the boilerworked by the engine in any approved way, and connected with it by pipes D. E is a pipe, with a checkvalve, E, connecting this holder with a heating-coil, F, in the space G, at the front, from which the hot air and exhaust steam escape. This coil is continued from the bottom of space G to the top of the boiler at H, where it connects with the pipe J, inside the boiler, which extends back into the steam-dome, and discharges the air into the throttle-pipe J.

The cold air is condensed to the extent of the boiler-pressure, when it passes the checkvalve E, by the pumps, and what is gained afterward by the expansion is utilized as working force in the engines.

In case air-brakes are used on the cars, I propose to take the air for working them from this holder by a pipe, I, and thus utilize the same air-pumps for supplying them that I use for supplying air to the boiler, and save the expense of a special pump for them.

By the use of expanded air in connection with the steam, I utilize a large measure of heat, which is otherwise Wasted, and thus economize about twenty per cent. of fuel.

Having thus described my invention, I claim as new and desire to secure by Letters Patent In connection with a locomotive-engine,tl1c heating-coil pipe J and pipe E, having checkvalve E, the throttle-pipe J, air-holder A, and air-pump 0, all combined, constructed, and operating, as shown and described, for heating and injecting air into the boiler, as specified.

GEORGE EDWIN HIBBARD. lVitnesses: I

H. BBYEN, ALEXANDER MoDoNALD, H. HULL. 

